Multiwalled bag



A. L. CURRIER MULTIWALLED BAG Jan. 20, 1931.

Filed June 9, i928 3 Sheets-Sheet l Jan. 20, I931.

MULTIWALLED BAG A. L. CLIRRIER 1,789,807

: Filed June 9, 192a 3 Sheets-Sheet 2 Jan. 20, 1931. R E 1,789,807

1 MULTI WALLED BAG Filed June 9, 1928 v 3 Sheets-Sheet 3 Patented Jan. 20, 1931 i UNITED, STATES PATENT OFFICE An'rnua L. cunmm, or Asnnunnnam, mAssAcnfisErrs, ASSIGNOR', BY unsus .AS sromnn'rs, 'ro CORNELL BAG coaronA'rIoN, A CORPORATION or DELAWARE MULTIWALLED BAG Application filed June 9,

The principal obgect of this invention,

among others not enumerated, is that of providing an end construction for multi-wall bags which is strong, durable, efficient in operation and is cheaply, quickly and easily -made.

The merits of the present invention will ap ar from the followin disclosure of one em odiment of my invention, which is given merely by way of example, and the utility of the invention will be obvious from the ad vantages which are realized in the particular embodiment illustrated.

' The following description will be morereadily understood by referring to the accompanyingdrawing in which- Figure 1 is a perspective view of a multiwall bag having an end constructed in accordance with this invention.

Figure 2 is a perspective view of a bag havin portions partially folded for forming an en in accordance with this invention, the view also showin how the tube is preferably first flattened be orethe end folds are made.

' Fi ure 3 is a view similar to Figure 2 showing the first flap folded inwardly for the production of the end. Y

Fi ure 4 is a view similar to Figure 3 showing the second fla folded inwardly for the production of the nished end, and represents the step just rior to the finishing of the bag as shown in igure 1.

Fi ure 5 is a ers ective view showin the a g P 3 end of a bag 0 vention.

Figure 6 is a view similar to Figure 5 showing a modified form of notches for assisting in separating the individual plies.

Figure 7 .is a perspective view of one end of a modified form of my' ina. bag constructed in accordance with another modified form of my invention.

Figure 8 is a plan view of the construction shpiwn in Figure 7 in its first folded position; an

Figures 9, 10 and 11 show the various'steps of the subsequent folds producing the finished end shown in Figure 11. i

Serial No. 284,236.

closure may be produced in any desirable manner, that is, they may be of a nested tube type or of a convolute' type or any other suitable type.

By referring to the drawings, it will be noted that thelnvention is illustrated in connection with a bag 10 formed from a multiwall tube 11 which has been prcviously'fiattoned, as shown in the figures of the drawing, and cut and folded in a manner to form flaps hereinafter designated side flaps 12 and 13, and end flaps 14 and 15. By the initial folding operationit will be noted that the side flaps are separated, causing the end flapsto extend inwardly to overlap portions of the side flaps as shown in Figure 2.

As a result of the initial folding operation,

the top plies 16 of the flaps 14 and 15' are a continuation of the underneath plies 17 of the side flaps 12 and 13. v

The side fla s 12 and 13 are adapted to be folded inwar 1y, one upon the other, along the lines 18 and 19, and secured so as to complete the bag end, as shown in Figure 1, but in order to effect an inter-leaving, the flap designated 12 in Figure 2 is divided into two "flaps 12 and 12', asshown in Figure 3, by

first cutting as at 21 the folded edges between the to plies 16and the underneath plies 17,

as in icated by the bracket 20 in Figure 2.

In the present type of bag the cut 21 produces a flap 22, which is cut off as at 23 to expose a portion 24 of the next beneath ply of the underside of the end flaps.

With the-flap 12 so cut as to produce the from which the bags are made in accordance with the present distwo flaps 12 and 12', the innermost flap 12 is folded. inwardly first, as is shown in Figure 4 i 3, and secured to the upper ply of the end in fia s 14 and 15. s

- The necessity for cutting the small triangular flap 22 away as at 23', is for the purpose of permitting the portion 24 of the next beneath pl which is uncut to come in contact with an be secured to the upper surface of the end flaps 14 and 15. With the parts so folded, adhesive is placed on the surfaces 25 of thefiaps 12 and 12', which are then presented upwardly, afterwhich the side iiap 13 is folded inwardly, as shown in Figure 4 and secured to the" upper surface of the fla 12. After this is accomplished the outsi e single ply flap is then folded inwardly on top of the then outer surface of the flap 13 to cover and conceal the entire joint and resent a bottom as shown in Figure 1. Itis obvious that the last ply, being of a single thickness, readily adheres to the other parts, quickly dries, and forms a smooth, neat, strong, finished bottom for the %n the above illustrated-form, what would ordinarily be two-side flaps have been formed into three flaps so as to present a single ply covering flap on the outside, but it is obvious that by arranging cuts similar to the cut 21 along the margins, either on one or both of the flaps 12 and 13 that the multi-ply flap may be separated to form as many individual flaps of as many plies as desired, and that the flaps may be inter-leaved and glued one upon the other with a final finishing or covering flap placed on top so as to reduce the smooth outer surface shown in igure 1.

For the purpose of separating the individual plies, the notch 30 is first provided for separating the opposite sides of the tube, one from the other, for effecting the initial fold as shown in Figure 2. The urpose of the notch, is to permit fingers of ol'din mechanism to grip one of the multi-ply wa ls without carrying with it the opposite wall. Likewise, wherever additional separation of plies is to be accomplished, as for instance be: tween the flaps 12 and 12', additional cuts or notches 31 may be provided to permit machinery to grip or fold one flap without disturbing the other. It is obvious that instead of locating the notches-31 in the single ply flap'12', it is possible to separate flaps 12 and 12' by notching the flap 12 when mechanism is employed constructed to accommodate such change.

wholly intact in an unnotched condition. The notches will, of course, in any case be located for cooperation with the particular machine employed.

When bottoms are being formed the ends will be folded and secured as above described, but it is to be'understood that when a valved end top is being made that one end of the bottom is left unsecured to provide an openvention is not to be limitedto a bag V If this be the case, the a finishing or covering flap- 12' will remain,

' its entire number of one end of the lie. 12, as folded on t e upper surface of the en flap i5, unsecured and wise leaving the inner surface 32 ofthe flap '13, as shown in Figure'3, unsecured where it engages the upper portion of the end flap 15. Such an. opening constitutes the well known type of valve opening for bags.

1 t is to be understood that the present invided with notches 31, as these are provlded merely for the purpose of accommodatin the multi-ply walls of the tube mechanism w ich will so arate the various plies to form the inde en ent flaps 12 and 12.

t is obvious that other means may be provided for accommodating the construction to suitable mechanism, one particular alternative form of which is shown in Figures 9 to 11,,inclusive, and will be hereinafter more fully pointed out.

In Figure 5 a modified form of bag is shown, in which the plurality of plies 50, 51,

52 and 53 are formed by cutting what would otherwise be the multi-ply side flap. Likewise, by cutting, the other side flap is converted into a plurality of individual'fiaps 54, 55, 56 and 57. The row of notches 60 is provided so that the o posits side walls of I the tube constituting t e bag may be separated to accomplish the initial folding and the smaller notches designated 61 and 62 are provided as one means for accommodating the flap construction to mechanism for separating each individual ply from the remainmg ply. It is obvious from this showin that each ply may be inter-leaved with the the opposite side flap and by considering this modification, together with the modification ms of shown in Figures 1 to4, it will be further ap- Y preciated that any arrangen'ient of interleaving may be effected and is contemplated in this invention.

By referrin to Figure 6 it will be noted that a modifie form of notching is provided by making cut-outs 70, 71, 72 and 73 in one flap 1n successively larger arcs about the same center so that an edge of each strip is individually presented in a manner to be ipped by properly adjusted gripping mec anism. Thesame type of notches are shown at 7 4 and 7 5 in the opposite side flap, for separating the individual component fiaps. I

By referring to Figures/Ito 11, inclusive,

a will be notedthat this modified form of the invention contemplates a slightly different typefof cutting of themulti-wall tube prior to the initial. folding operation, and is one which produces the strai ht edges 80 and 81 between the side and end aps. This particular modification illustrates the form of end where the side flap 82 remains intact with plies unseparated and the opposite side flap, by cutting its outside ly as at 83, is formed into two independent aps 84 and 85. It will benoted that by cutting in this particular manner the triangular end portions 86 on the opposite sides of the flap 83 are cut away from and are free to be folded inwardl with'the side flaps 83 and independently of the fiap'85.

It may be noted to better understand the construction that the small triangular portions86 before the cutting as at 83 were continuations of the outer flap 85. The manner of folding to form the finished end is substantially like the modified form shown in Figures 1 to 41-, inclusive, and is clearly il lustrated in Figures 9 to 11, inclusive. Figure 8 illustrates the initial folding operation and Figure 9 shows the next succeeding operation where the flap 84 is folded inwardly and secured by adhesive to'the upper ply of the end flaps. The construction in this instance is such that the flaps 84 and 85 may be readily separated by folding mechanism in that suitable fingers or other contact elements may engage the small triangular portions 86 and b roper movement cause the same to be fol ed inwardly without folding the outer fla 85 with it. The next folding operation is isclosed in Figure 10 where the sidefiap 82 is folded inwardl on to of flap 84 and properly secured. The finis ed end is accomplished by folding the flap 85 on top of flap 82 where it is secured to cover and protect the entire jointure between the flaps and provide a smooth, neat appearing fin ished end. i

It will be readily appreciated that the particular manner of cutting illustrated in this form for providing the small triangular portions 86 eliminates the necessity for notching either of the flaps 84 and 85 for effecting a separation thereof.

The'advantages of this invention which are realized from the particular disclosure herein given, among others not enumerated, are that a more secure, neater appearing bag end is provided, which is strong and durable in service. "It is further one which may be. more quickly produced in that it hastens the drying action of the adhesive. This is true because the. adhesive is applied to a larger absorbing surface than in bags of other constructions, and, further in that a small volume of adhesive may be employed for secur-.

ing comparatively thin flaps as compared with bulky, multi-ply flaps. c,

As above brought out, although this invention is applicable to multi-ply tubes of-the. nested tube type, it has particular advantage as applied to the convolute typedisclosed in the co-pending application referred to for the reason that the tube end ma. be formed by initially cutting the elonga strip of stock before the tube is wound. This renders it (Elite easy to provide cuts in the mult-ply tu which penetrate only a single edge of the ply or a number of plies less than the entire thicknessof the bag. It, of course, is understood that the cuts will be so made and located that the proper cut tube edge will be formed by re 'stration by winding the tube.

The above isclosure is given merely as one embodiment of the present invention, which is not to be considered as limiting the invention in any way. The scope of the invention will be determined by an understanding of the present disclosure as one embodiment thereof and will be particularly pointed out- 'in the appended claims.

I claim:

1. A bag comprising a muti-ply tube having a bottom including portions of said tube, said bottom comprising side flaps, one of said side flaps constituting a plurality of flaps of less thickness than said tube, all of said side flaps being interleaved'and secured one upon the other.

2;. A bag of the character described com prising a multi-ply tube, said tube having multi-ply opposed extensions constituting flaps, at least one of said flaps having some of its plies separated to form a plurality of flaps, said flaps being folded inwardly and interleaved to form a bottom for said bag.

3. A bag of the character described comprising a multi-ply tube and a folded end,

said end comprising opposed flaps formed from portions of said tube, two of which are on the same side of said bag and of less thickness than said tube; all of said flaps being interleaved and secured to each other.

,4. A bag of the character described comprising a multi-plv tube, said tube having multi-pl oppose extensions folded inwardly orming an end for said bag, one of said extensions constituting a plurality of flaps interleaved with and secured tothe opposed extension.

5. A bag of the character described om- I prising a multi-ply tube, a portion of said prising a multi-ply tube, a portion of said.

tube being folded to form opposed end and side flaps, one of said side flaps having some,

of its plies separated to form flaps of dimin- .ished thickness, and all of said flaps being folded inwardly and interleaved and secured one upon the other, said flaps having means permitting ready separation each from the other. Y k

7. A bag of the character described comprising a body portion and a bottom having opposed multi-ply flaps, the plies of said flaps constituting individual thinner flaps interleaved and secured in overlapping relation.

' 8. A bag of the character described comprising a bod portion and a closed end, the closed end inc uding opposed multi-ply flaps, one of said flaps having its plies separated and having certain inner plies folded in beneath plies of theopposing flap and having its outer ly overlying the outer ply of the opposed ap.

' 9. A bag of the character described comprising a body portion and a closed end, said end including opposed flaps, one of which flaps is multi-ply and has its plies separated to form an inner part and an outer part with the inner part underlying the o posed flap and the outer part overlying tie opposed 10; A bag in accordance with claim 9 and m which the outer part consists of one ply andthe inner part of the remaining plies of the flap.

Signed at Fitchburg, Mass, this 5th day of June, 1928.

' ARTHUR L. CURRIER. 

